Motocross Bikes
2007KTM 50 SX Junior
33 fields on record
The 2007 KTM 50 SX Junior is a lightweight minibike designed for young riders entering motorsports, featuring a simple 49cc liquid-cooled two-stroke engine with kick-start and adjustable centrifugal clutch. Known for its proven reliability and agile handling, this entry-level machine excels in off-road environments and junior racing circuits. Its minimal weight and forgiving character make it ideal for developing fundamental riding skills.
- Capacity
- 49.0 ccm
- Engine
- Single, two-stroke
- Gearbox
- Not on record
Know it? Add it → - Dry weight
- 37.6 kg
- Seat height
- 585 mm
- Power
- 5.4 HP (4.0 kW)
What’s new for the 2007 KTM 50 SX Junior
vs the 2006| Spec | 2006 | 2007 |
|---|---|---|
| Front suspension | Marzocchi 32 mm (1.26 inches) | Marzocchi, 32 mm (1.26 |
How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- It exists purely to teach small children the basics of off-road motorcycling in a safe, low-power, automatic-clutch package.
- Built for
- Simple, forgiving, and non-intimidating, this minibike is designed to build confidence with gentle power delivery and no manual shifting required.
- Not ideal for
- It is not suitable for teenagers, adults, road use, or anyone seeking real speed, power, or long-distance capability.
Scores are derived from the spec sheet using the same model across every bike, so they compare like for like.
Will it fit you?
Worked out in your browser - nothing is sent to usEngine
- Capacity
- 49.0 ccm
- Power
- 5.4 HP (4.0 kW)
- Engine type
- Single, two-stroke
- Power/weight ratio
- 0.1436 HP/kg (dry)
- Bore x stroke
- 39.5 x 40.0 mm
- Compression
- 12.5:1
- Cooling system
- Liquid
- Fuel system
- Carburettor
- Starting
- Kick
- Ignition
- Seletra analogue
- Lubrication system
- Mixture 1:60
Transmission
- Transmission type
- Automatic
- Final drive
- Chain
- Clutch
- Centrifugal clutch (adjustable)
Dimensions & weight
- Wheelbase
- 910 mm
- Seat height
- 585 mm
- Dry weight
- 37.6 kg
- Fuel capacity
- 1.80 litres
- Ground clearance
- 220 mm
Chassis & suspension
- Frame
- Central double-cradle-type frame
- Front suspension
- Marzocchi, 32 mm (1.26
- Rear suspension
- WP monoshock
- Front wheel travel
- 115 mm
- Rear wheel travel
- 185 mm
- Rake (fork angle)
- 24.0°
- Trail
- 90 mm
Brakes & wheels
- Front brakes
- Single disc
- Front brakes diameter
- 160 mm
- Rear brakes
- Expanding brake (drum brake)
- Rear brakes diameter
- 90 mm
- Front tyre
- 2.50-10
- Rear tyre
- 2.75-10
Compiled from manufacturer documentation and user contributions, corrected on an ongoing basis. Spotted something wrong? Tell us.
What changed, year to year
Differences highlighted| Specification | 2006 | 2007 | 2008 | 2009 |
|---|---|---|---|---|
| Capacity | 49 cc | 49 cc | 49 cc | 49 cc |
| Dry weight | 38 kg | 38 kg | 38 kg | 38 kg |
| Seat height | 585 mm | 585 mm | 585 mm | 607 mm |
| Fuel capacity | 1.8 L | 1.8 L | 1.8 L | 2.3 L |
Illustrative - generated automatically by diffing the year records already on file, not a manufacturer-published changelog.
Rider Reviews
Common questions
What is the engine size of the KTM 50 SX Junior?
The 2007 KTM 50 SX Junior has a Capacity of 49.0 ccm (2.99 cubic inches).
What engine power does the KTM 50 SX Junior have?
The 2007 KTM 50 SX Junior has a Power of 5.4 HP (4.0 kW).
How much does the KTM 50 SX Junior weigh?
The 2007 KTM 50 SX Junior has a Dry weight of 37.6 kg (82.9 pounds).
Shop this bike
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The 2007 KTM 50 SX Junior is a little gem that packs a powerful punch for its size. Arguably one of the best models in the mini dirt bike market, this machine boasts a 2-stroke engine, automatic transmission and a sturdy chassis that ensures durability and longevity. Optimized for young riders, the KTM 50 SX Junior offers superb handling, and unparalleled throttle response, providing a smooth and controlled riding experience. Its compact size coupled with its impressive acceleration and top speed make this bike a fantastic choice for beginner riders. The hydraulic disc brakes give young riders the safety needed to develop confidence in their riding abilities.
What really sets the 2007 KTM 50 SX Junior apart is its premium build quality. Trustworthy and reliable, this bike requires minimal maintenance, letting young riders spend more time on the dirt and less time in the garage. It has adjustable suspension which allows for customization based on the rider’s weight and the terrain, further enhancing its versatility and usability. The bike's innovative design and stellar performance easily rank it among the top contenders in the 50cc class. Overall, the 2007 KTM 50 SX Junior offers a fantastic off-road riding experience for young motorcyclists, combining power, control, and reliability in a compact and stylish package.
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